fix(exam): fix pretest screen start exam button

app/exam/[id]/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
-import { useParams, useRouter, useSearchParams } from "next/navigation";
 import React, { useEffect, useState, useCallback } from "react";
+import { useParams, useRouter, useSearchParams } from "next/navigation";
 import { useTimer } from "@/context/TimerContext";
 import { useExam } from "@/context/ExamContext";
 import { API_URL, getToken } from "@/lib/auth";
@@ -16,11 +16,10 @@ interface Question {
 
 interface QuestionItemProps {
   question: Question;
-  selectedAnswer: string | undefined;
+  selectedAnswer?: string;
   handleSelect: (questionId: number, option: string) => void;
 }
 
-// Components
 const QuestionItem = React.memo<QuestionItemProps>(
   ({ question, selectedAnswer, handleSelect }) => (
     <div className="border border-[#8abdff]/50 rounded-2xl p-4">
@@ -55,16 +54,10 @@ QuestionItem.displayName = "QuestionItem";
 
 export default function ExamPage() {
   const router = useRouter();
-  const params = useParams();
-  const searchParams = useSearchParams();
-  const [isSubmitting, setIsSubmitting] = useState(false);
-
-  const id = params.id as string;
-  const time = searchParams.get("time");
+  const { id } = useParams();
+  const time = useSearchParams().get("time");
 
   const { setInitialTime, stopTimer } = useTimer();
-
-  // Use exam context instead of local state
   const {
     currentAttempt,
     setAnswer,
@@ -75,85 +68,77 @@ export default function ExamPage() {
     isExamCompleted,
     isHydrated,
     isInitialized,
+    currentExam,
   } = useExam();
 
   const [questions, setQuestions] = useState<Question[] | null>(null);
   const [loading, setLoading] = useState(true);
+  const [isSubmitting, setIsSubmitting] = useState(false);
   const [submissionLoading, setSubmissionLoading] = useState(false);
 
-  // Check if exam is properly started
   useEffect(() => {
-    if (!isHydrated) return;
-    if (!isInitialized) return;
-    if (isSubmitting) return; // Don't redirect while submitting
+    console.log(
+      "hydrated:",
+      isHydrated,
+      "initialized:",
+      isInitialized,
+      "exam:",
+      currentExam
+    );
+  }, [isHydrated, isInitialized, currentExam]);
 
-    if (!isExamStarted()) {
-      router.push("/unit");
-      return;
-    }
-
-    if (isExamCompleted()) {
-      router.push("/exam/results");
-      return;
-    }
+  // Initial checks
+  useEffect(() => {
+    if (!isHydrated || !isInitialized || isSubmitting) return;
+    if (!isExamStarted()) return router.push("/unit");
+    if (isExamCompleted()) return router.push("/exam/results");
   }, [
     isHydrated,
+    isInitialized,
     isExamStarted,
     isExamCompleted,
-    router,
-    isInitialized,
     isSubmitting,
+    router,
   ]);
 
-  const fetchQuestions = async () => {
-    try {
-      const response = await fetch(`${API_URL}/mock/${id}`, {
-        method: "GET",
-      });
-      const data = await response.json();
-      setQuestions(data.questions);
-    } catch (error) {
-      console.error("Error fetching questions:", error);
-    } finally {
-      setLoading(false);
-    }
-  };
-
+  // Fetch questions
   useEffect(() => {
+    const fetchQuestions = async () => {
+      try {
+        const response = await fetch(`${API_URL}/mock/${id}`);
+        const data = await response.json();
+        setQuestions(data.questions);
+      } catch (error) {
+        console.error("Error fetching questions:", error);
+      } finally {
+        setLoading(false);
+      }
+    };
     fetchQuestions();
-    if (time) {
-      setInitialTime(Number(time));
-    }
+    if (time) setInitialTime(Number(time));
   }, [id, time, setInitialTime]);
 
   const handleSelect = useCallback(
     (questionId: number, option: string) => {
-      // Store answer in context instead of local reducer
       setAnswer(questionId.toString(), option);
     },
     [setAnswer]
   );
 
   const handleSubmit = async () => {
-    if (!currentAttempt) {
-      console.error("No exam attempt found");
-      return;
-    }
+    if (!currentAttempt) return console.error("No exam attempt found");
 
     stopTimer();
     setSubmissionLoading(true);
-    setIsSubmitting(true); // Add this line
+    setIsSubmitting(true);
 
-    // Convert context answers to the format your API expects
-    const answersForAPI = currentAttempt.answers.reduce((acc, answer) => {
-      acc[parseInt(answer.questionId)] = answer.answer;
-      return acc;
-    }, {} as Record<number, string>);
-
-    const payload = {
-      mock_id: id,
-      data: answersForAPI,
-    };
+    const answersForAPI = currentAttempt.answers.reduce(
+      (acc, { questionId, answer }) => {
+        acc[+questionId] = answer;
+        return acc;
+      },
+      {} as Record<number, string>
+    );
 
     try {
       const response = await fetch(`${API_URL}/submit`, {
@@ -162,33 +147,19 @@ export default function ExamPage() {
           "Content-Type": "application/json",
           Authorization: `Bearer ${await getToken()}`,
         },
-        body: JSON.stringify(payload),
+        body: JSON.stringify({ mock_id: id, data: answersForAPI }),
       });
 
-      if (!response.ok) {
-        const errorData = await response.json();
-        console.error(
-          "Submission failed:",
-          errorData.message || "Unknown error"
-        );
-        setIsSubmitting(false); // Reset on error
-        return;
-      }
+      if (!response.ok)
+        throw new Error((await response.json()).message || "Submission failed");
 
       const responseData = await response.json();
-
-      // Submit exam in context (this will store the completed attempt)
-      const completedAttempt = submitExamContext();
-
-      // Store API response in context for results page
+      submitExamContext();
       setApiResponse(responseData);
-
-      // Navigate to results without URL parameters
       router.push("/exam/results");
-      console.log("I'm here");
     } catch (error) {
       console.error("Error submitting answers:", error);
-      setIsSubmitting(false); // Reset on error
+      setIsSubmitting(false);
     } finally {
       setSubmissionLoading(false);
     }
@@ -201,12 +172,10 @@ export default function ExamPage() {
     }
   };
 
-  // Handle browser back button
   useEffect(() => {
     const handleBeforeUnload = (e: BeforeUnloadEvent) => {
       e.preventDefault();
       e.returnValue = "";
-      return "";
     };
 
     const handlePopState = (e: PopStateEvent) => {
@@ -225,12 +194,10 @@ export default function ExamPage() {
 
   if (submissionLoading) {
     return (
-      <div className="min-h-screen bg-gray-50">
-        <div className="container mx-auto px-4 py-8">
-          <div className="flex flex-col items-center justify-center min-h-64">
-            <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-900 mb-4"></div>
-            <p className="text-lg font-medium text-gray-900">Submitting...</p>
-          </div>
+      <div className="min-h-screen bg-gray-50 flex items-center justify-center">
+        <div className="text-center">
+          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-900 mb-4"></div>
+          <p className="text-lg font-medium text-gray-900">Submitting...</p>
         </div>
       </div>
     );
@@ -252,11 +219,11 @@ export default function ExamPage() {
           </div>
         ) : (
           <div className="space-y-6 mb-20">
-            {questions?.map((question) => (
+            {questions?.map((q) => (
               <QuestionItem
-                key={question.id}
-                question={question}
-                selectedAnswer={getAnswer(question.id.toString())}
+                key={q.id}
+                question={q}
+                selectedAnswer={getAnswer(q.id.toString())}
                 handleSelect={handleSelect}
               />
             ))}